package zhouyang;

import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

/**
 * 多线程之间按顺序调用，实现A->B->C
 * AA打印5次，BB打印10次，CC打印15次
 * 如此顺序循环10次
 * 1.高内聚低耦合前提下，线程操作资源类
 * 2.判断/干活/通知
 * 3.多线程交互中，必须要防止多线程的虚假唤醒，也即(判断只能用while，不能用if)
 * 4.标志位
 */
class ShareResource{
    private int number= 1;//1：A  2:B  3:C
    private Lock lock = new ReentrantLock();
    private Condition condition1 = lock.newCondition();
    private Condition condition2 = lock.newCondition();
    private Condition condition3 = lock.newCondition();
    public void  print5(){
        lock.lock();
        try {
            while (number!=1){
                condition1.await();
            }
            for (int i = 1; i <=5; i++) {
                System.out.println(Thread.currentThread().getName()+"\t"+i);
            }
            number=2;
            condition2.signal();
        }catch (Exception e){
            e.printStackTrace();
        }finally {
            lock.unlock();
        }
    }
    public void print10(){
        lock.lock();
        try {
            while (number!=2){
                condition2.await();
            }
            for (int i = 1; i <=10; i++) {
                System.out.println(Thread.currentThread().getName()+"\t"+i);
            }
            number=3;
            condition3.signal();
        }catch (Exception e){
            e.printStackTrace();
        }finally {
            lock.unlock();
        }
    }
    public void print15(){
        lock.lock();
        try {
            while (number!=3){
                condition3.await();
            }
            for (int i = 1; i <=15; i++) {
                System.out.println(Thread.currentThread().getName()+"\t"+i);
            }
            number=1;
            condition1.signal();
        }catch (Exception e){
            e.printStackTrace();
        }finally {
            lock.unlock();
        }
    }
}
public class ThreadOrderAccess {
    public static void main(String[] args) {
        ShareResource shareResource= new ShareResource();
        new Thread(()->{
            for (int i = 1; i <=10; i++) {
                shareResource.print5();
            }
        },"A").start();
        new Thread(()->{
            for (int i = 1; i <=10; i++) {
                shareResource.print10();
            }
        },"B").start();
        new Thread(()->{
            for (int i = 1; i <=10; i++) {
                shareResource.print15();
            }
        },"C").start();
    }
}
